Adjustable form for concrete arches.



P. ZUCCU. ADJUSTABLE FORM. FOR CONCRETE ARCHES. APPLICATION man APR. 4` |911.

l ,262,573 Y Patented Apr. 9, 1918.

WITNESSES:

PIERRE ZUCCO, 0F SAN' FRANCISCO, CALIFORNIA.

ADJUSTABLE FORM FOR. CONCRETE ARCHES.

Specification of Letters Patent.

rammed apr. a, raie..

l Application iiled April 4, 1917. Serial No. 159,703.

To @ZZ whom t may concern:

Be it known'that I, PIERRE Zucco, acitizen of the United States, residing at the city and county of San Francisco and State of California, have invented new and useful improvements in Adjustable Forms for Concrete Arches, of which the following is a specication. 4

rThis invention relates to forms for concrete arches, with particular reference to floor construction; and has for its object to provide a collapsible form which shall be quickly and easily adjustable to vary the rise of the arch.

ln the present invention I employ an arch form of any suitable material and shape which is removably held in place on t e false-work, with the legs of adjacent arches embracing the horizontal support for the abutment of the arch by means of novel and advantageous clamps. The arch forms and abutment supports are adjustable vertically relative to each other', whereby to vary the height of the abutments and thereby the rise of the arch, and bv reason. of the arrangement of the arch forms extending outside of the abutment supports and detachably connected thereto, the said forms may be removed without disturbing the abutment supports and remaining false-work so that said forms may be re-used before the concrete is setsuiiiciently to support itself.

ln the accompanying drawings:

Figure 1 shows a transverse, sectional view of an arch embodying my invention.

Fig. 2 shows a longitudinal sectional view of the same.

Fig. 1 shows a horizontally extending abutment support 11 forming a part of the temporary support or false-Work for the arch, running longitudinally of the forms and receiving and supporting the latter at their edges.

Embracingthe abutment supports are arch forms 14 of any desired shape and character of material. Preferably they have their legs 15 made somewhat longer than usual and provided with a series of perforations or apertures 16 to receive prongs 17 formed on the arms of clamps 18. The arch forms in reality receive their support entirely from the prongs in engagement with 'the abutment support and by extending the prongs through other openings than those shown the vlegs and abutment supports may be adjusted vertically relative to each other, whereby to vary the height of the arch. 1

The intermediate portion of each clamp passesbelow the abutment support and hasv a transverse screw or rod 23 for drawing the arms together, wherebyV to hold the legs in engagement with the 'sides of the abutment support. The arms of the clamps provide relatively long supports which prevent the sides of the arches from bulging outwardly under the weight of the concrete.

The temporary sup-ports or false-work (not shown) are rst put in place with the abutment supports 1l positioned at the required height and the arch forms are then put in place with their legs extending along the opposite sides of the abutment supports and held thereagainst by means of the clamps 18 arranged at suitable intervals.

By means of the prongs 17 the legs are positioned vertically according to the height of the arch desired. The concrete is poured into place and shortly thereafter the arch forms may be removed, leaving the abutmentsupports in place, it being unnecessary to leave the arch forms in place until the concrete has become set suficiently to support itself. For this reason a fewer numberof arch forms are made necessary in` constructing a building. ,A

Having thus described my invention, what I claim and desire to secure by Letters Patent is- 1. In a form for constructing concrete floors', an abutment supportan arch form having legs embracing opposite sides of the abutment support, and a clamp of substantially U-shapehaving prongs extending inwardly from the inner side faces of the arms of the clamp and formed so as to engage in perforations provided therefor in the legs of the arch form, the clamp being arranged so as to have its base extend below and across the abutment support and having a transverse rod member loelowsaid abutment support and engaged with intermediate parts of the arms of the clamp for drawing said arms together and against the opposite faces of the arch form legs.

2. In a form for constructing concrete floors, an abutment support, an arch form having legs embracing opposite sides of the abutment support, a clamp of substantially U-shape having arms which embrace opposite side faces of the legs of the arch form ico so as to provide relativel long supports for said legs preventing bu ging thereof, said clamp havlng means engaging the abutment support to hold the orm against down movement, and means engaged with intermediate arts of the clamp arms and extending t ereaeross to draw same together.

3. ln a form for constructing concrete floors, an abutment support, an arch form having legs embracing opposite sides of the abutment support, a clamp of substantially U-shape having arms which embrace opposite side'faces of the legs of the arch form so as to provide relatively long supports for said' legspreventing bulging thereof,.said

clamp including means engaged with intermediate parts of the clamp arms and extending thereacross to draw same together, and means on the arms to extend through perforations provided therefor in the arch form l lw1tnesses.

megeve legs and engage the abutment support to hold said form agalnst vertical movement.A

4. ln a forln for constructing concrete fioors, an abutment support, an arch form having legs embracing opposite sides of the abutment support, and a clamp having parts embracing opposite sides of the arch form with means to draw the clamp parts together, said clamp also having means extending transversely to the sides of the arch form legs and engaging the abutment support to hold the form against downward movement.

f ln testimony whereof li have hereunto set mv hand in the presence of two subscribing lPlERRE ZUUC. Witnesses:

JOHN H. HERRING,

W. W. HEALEY. 

